Søren Kierkegaard (1813-1855) wrote, “Jesus says, “Forgive, and you will be forgiven.” That is to say, forgiveness is forgiveness. Your forgiveness of another is your own forgiveness; the forgiveness you give is the forgiveness you receive. If you wholeheartedly forgive your enemy, you may dare hope for your own forgiveness, for it is one and the same. God forgives you neither more nor less than as you forgive your trespassers.
It is an illusion to imagine that you have forgiveness while you are slack in forgiving others. No, there is not a more exact agreement between the sky above and its reflection in the sea below, than there is between forgiveness and forgiving. Is it not pure conceit to believe in your own forgiveness when you will not forgive others? For how in truth can you believe in forgiveness if your life is a refutation of the existence of forgiveness? Yes, to accuse another person before God is to accuse yourself, like-for-like.”
“Not forgiving is like drinking rat poison and then waiting for the rat to die.” Anne Lamott.
“For if you forgive men their trespasses, your heavenly Father will also forgive you. But if you do not forgive men their trespasses, neither will your Father forgive your trespasses.” Jesus